Co3O4 nanoparticles assembled coatings synthesized by different techniques for photo-degradation of methylene blue dye

Authors:  T. Warang, N. Patel, R. Fernandes, N. Bazzanella, A. Miotello

Abstract:
Co₃O₄ nanoparticles assembled coatings have been synthesized by physical(pulsed laser deposition (PLD) and electron beam deposition) and chemical (sol–gel and electroless) techniques. The morphological, structural, and optical properties of allthe coatings were analyzed by SEM,XRD,Raman spectroscopy,XPS, and UV–vis spectroscopy. The catalytic activities of the several Co₃O₄ heterogeneous catalyst coatings have been compared by looking at their efficiency on degradation of methylene blue dye that occurs via photo Fenton reaction in presence of H₂O₂ or oxone oxidants. The coating synthesized by PLD exhibits the best photo-degradation rate of dye in presence of H₂O₂ (4 h) or oxone (8 min). The NPs produced by PLD process exhibit smaller average size (18 nm), narrow size distribution ( = 3 nm), perfect spherical shape, low degree of agglomeration, and mixed amorphous-nanocrystalline phase. These special features of NPs, along withbetter visible light absorption, are themainfactors responsible for the enhanced photocatalytic activity of the PLD Co₃O₄ NPs assembled coating. It is also observed that although the concentration of oxone (0.5 mM) was very small as compared to H₂O₂ (100 mM)the photo-degradation of MB dye solution is much faster for oxone.

Keywords:
Pulsed laser deposition
Electron beam deposition
Sol–gel
Co-precipitation
Photocatalytic degradation

Published in: Applied Catalysis B: Environmental (Volumes 132–133, Pages 1-552, 27 March 2013)

Publisher: Elsevier  

ISSN Information: 0926-3373

Co3O4 nanoparticles assembled coatings synthesized by different techniques for photo-degradation of methylene blue dye

Bình luận của bạn

*

*

*

*

 Captcha

Gửi bình luận nhập lại